Question

Find the 20th term from the last term of the AP: 3,8,13,., 253​

Answer 1

Step-by-step explanation:

a= 3

d=a2-a1

=8-3

= -5

an= 253

now let's write from the last terms the last terms 253,248,243..........13,8,3

so, a=253

d=-5

n=20

so , an = a+ (n-1) d

a20= 253(n-1)(-5)

= 253+(20-1)(-5)

= 253+(19)(-5)

=253-95

a20=158

Therefore the 20th term from the last term of AP is 158 .

Answer 2

Answer:

your answer is 158

Step-by-step explanation:

a = 3,d=5

253=3+5(n-1)

Or , 5 ( n - 1 ) =250

Or , n - 1 = 50

Or , n = 51

So , the 20th term from the last term = 51 - 19 = 32nd term

Now n³² = 3 + 5 × 31 = 158

Hence Proved

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Ayush Ranjan Swain

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